Question

The vertical height of a right circular conical tent is 4 m and the volume of space inside it is 138 2/7 m3. Find the canvas required to make the tent. Also find the cost of canvas at the rate of rs 120 per m2.

Answer 1

Volume of space inside=138 2/7 m3= 138.28m3
 height=4 m
:.r= $\sqrt3*V/ \pi h}$
⇒$\sqrt{3*138.28/3.14*4}$
r=5.75
LSAA of cone=126.53m²
    :.126.53m² canvas is required 
cost of canvas(1m²)= rs 120 per m²

:.cost of canvas(126.53m²)=120*126.53⇒⇒15183.6